1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Authors: Lotsa people, from code originally in tcp 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 #ifndef _INET6_HASHTABLES_H 15 #define _INET6_HASHTABLES_H 16 17 #include <linux/config.h> 18 19 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) 20 #include <linux/in6.h> 21 #include <linux/ipv6.h> 22 #include <linux/types.h> 23 24 #include <net/ipv6.h> 25 26 struct inet_hashinfo; 27 28 /* I have no idea if this is a good hash for v6 or not. -DaveM */ 29 static inline unsigned int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport, 30 const struct in6_addr *faddr, const u16 fport) 31 { 32 unsigned int hashent = (lport ^ fport); 33 34 hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]); 35 hashent ^= hashent >> 16; 36 hashent ^= hashent >> 8; 37 return hashent; 38 } 39 40 static inline int inet6_sk_ehashfn(const struct sock *sk) 41 { 42 const struct inet_sock *inet = inet_sk(sk); 43 const struct ipv6_pinfo *np = inet6_sk(sk); 44 const struct in6_addr *laddr = &np->rcv_saddr; 45 const struct in6_addr *faddr = &np->daddr; 46 const __u16 lport = inet->num; 47 const __u16 fport = inet->dport; 48 return inet6_ehashfn(laddr, lport, faddr, fport); 49 } 50 51 extern void __inet6_hash(struct inet_hashinfo *hashinfo, struct sock *sk); 52 53 /* 54 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so 55 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM 56 * 57 * The sockhash lock must be held as a reader here. 58 */ 59 extern struct sock *__inet6_lookup_established(struct inet_hashinfo *hashinfo, 60 const struct in6_addr *saddr, 61 const u16 sport, 62 const struct in6_addr *daddr, 63 const u16 hnum, 64 const int dif); 65 66 extern struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo, 67 const struct in6_addr *daddr, 68 const unsigned short hnum, 69 const int dif); 70 71 static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo, 72 const struct in6_addr *saddr, 73 const u16 sport, 74 const struct in6_addr *daddr, 75 const u16 hnum, 76 const int dif) 77 { 78 struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport, 79 daddr, hnum, dif); 80 if (sk) 81 return sk; 82 83 return inet6_lookup_listener(hashinfo, daddr, hnum, dif); 84 } 85 86 extern struct sock *inet6_lookup(struct inet_hashinfo *hashinfo, 87 const struct in6_addr *saddr, const u16 sport, 88 const struct in6_addr *daddr, const u16 dport, 89 const int dif); 90 #endif /* defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) */ 91 #endif /* _INET6_HASHTABLES_H */ 92